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The use of an R value is convenient when more than one material is going to be used in the hearth

extension to cover the combustible surface. This is because R values are additive, whereas K values are

not. To find the corresponding R factor to use for some selected materials, please see Table Thermal

characteristics of common floor protection materials in this section.

There are two ways to calculate the R factor of the floor protection. First, by adding the R-values of

materials used, or by the conversion if the K factor and thickness of the floor protection are given.

To calculate the total R factor from R factors of the materials used, simply add the R-values of materials.

If the result is equal to or greater than the R-value requirements, the combination is acceptable. To know

the R-values of some selected materials, see table Thermal characteristics of common floor protection

materials.

Example:

Required floor protection R of 1.00. Proposed materials: four inches of brick and one inch of

Durock

board

Four inches of brick (R = 4 x 0,2 = 0,8) plus 1 inch of Durock

(R = 1 x 0.52 = 0.52).

0.8 + 0.52 = 1.32.

This R value is larger than the required 1.00 and is therefore acceptable

In the case of a known K and thickness of alternative materials to be used in combination, convert all K

values to R by dividing the thickness of each material by its K value. Add the R values of your proposed

materials as shown in the previous example.

Example:

K value = 0.75

Thickness = 1

R value = Thickness/K = 1/0.75 = 1.33

Data for floor protection calculation

(Note 1)

C E

Smaller

than 6 ft

Bigger or

= to 6 ft

INCHES 16" 20"

CAN: 18"

USA: 16"

5 3/8" 9 7/8"

MILLIMETRE

406 mm 508 mm

CAN: 457 mm

USA: 406 mm

137 mm 251 mm

*Refers to masonry fireplace opening.

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